Reading DWORD incorrectly with AS3? - actionscript-3

Question

In this question I got an answer on how to use this information to read BLB files. So I followed the instructions, and it appears that I'm reading the header properly.
However, when I try to read the file IDs, I get an end of file runtime error:
[Fault] exception, information=Error: Error #2030: End of file was encountered.
Here's my code.
Base class:
package
{
import flash.display.Sprite;
import flash.filesystem.File;
import flash.filesystem.FileStream;
import flash.utils.ByteArray;
import flash.utils.IDataInput;
import flash.filesystem.FileMode;
public class BLBDecompress extends Sprite
{
private var _file:File;
private var _stream:FileStream;
private var _blbBytes:ByteArray;
private var _header:Header;
private var _fileIDs:Array;
public function BLBDecompress()
{
decompress();
}
private function decompress():void
{
_file = File.applicationDirectory.resolvePath("testfiles/t.blb");
_blbBytes = new ByteArray();
_stream = new FileStream();
_stream.open(_file, FileMode.READ);
_stream.readBytes(_blbBytes);
_stream.close();
_header = readHeader(_blbBytes);
_fileIDs = new Array();
for (var i:int = 0; i < _header.dwNumber; i++)
{
_fileIDs.push(readFileID(_blbBytes));
}
}
private function readHeader(input:IDataInput):Header
{
var header:Header = new Header();
header.szID = new ByteArray();
input.readBytes(header.szID, 0, 4);
header.bID = input.readUnsignedByte();
header.bUnknown = input.readUnsignedByte();
header.wDataSize = input.readUnsignedShort();
header.dwFileSize = input.readUnsignedInt();
header.dwNumber = input.readUnsignedInt();
return header;
}
private function readFileID(input:IDataInput):uint
{
var fileID:uint = input.readUnsignedInt();
return fileID;
}
}
}
Header class:
package
{
import flash.utils.ByteArray;
public class Header
{
public var szID:ByteArray;
public var bID:uint;
public var bUnknown:uint;
public var wDataSize:uint;
public var dwFileSize:uint;
public var dwNumber:uint;
public function Header()
{
}
}
}
The thing is that _header.dwNumber returns/traces as 1090650112 (41020000 in base 16), so I can imagine that would reach the end of the file. So am I reading it wrong, using it wrong, or doing something else wrong? The rest of the
If it helps, this is an AIR application, and I'm using FlashDevelop with the Flex 4 SDK.

Answer 1

That look like a simple Big/Little endian problem, the 4 bytes that make up the DWORD are in the file in a different order to that used by your processor.
You need to reverse the order of the bytes in the DWORD to get 00000241, and any other multibyte number